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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="doccomment">//! A logger configured via an environment variable which writes to standard</span>
<span class="doccomment">//! error.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Example</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! #[macro_use] extern crate log;</span>
<span class="doccomment">//! extern crate env_logger;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use log::LogLevel;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//!     env_logger::init().unwrap();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     debug!(&quot;this is a debug {}&quot;, &quot;message&quot;);</span>
<span class="doccomment">//!     error!(&quot;this is printed by default&quot;);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     if log_enabled!(LogLevel::Info) {</span>
<span class="doccomment">//!         let x = 3 * 4; // expensive computation</span>
<span class="doccomment">//!         info!(&quot;the answer was: {}&quot;, x);</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Assumes the binary is `main`:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=error ./main</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=info ./main</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=debug ./main</span>
<span class="doccomment">//! DEBUG:main: this is a debug message</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You can also set the log level on a per module basis:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=main=info ./main</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! And enable all logging:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=main ./main</span>
<span class="doccomment">//! DEBUG:main: this is a debug message</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! See the documentation for the log crate for more information about its API.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Enabling logging</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Log levels are controlled on a per-module basis, and by default all logging</span>
<span class="doccomment">//! is disabled except for `error!`. Logging is controlled via the `RUST_LOG`</span>
<span class="doccomment">//! environment variable. The value of this environment variable is a</span>
<span class="doccomment">//! comma-separated list of logging directives. A logging directive is of the</span>
<span class="doccomment">//! form:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```text</span>
<span class="doccomment">//! path::to::module=log_level</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The path to the module is rooted in the name of the crate it was compiled</span>
<span class="doccomment">//! for, so if your program is contained in a file `hello.rs`, for example, to</span>
<span class="doccomment">//! turn on logging for this file you would use a value of `RUST_LOG=hello`.</span>
<span class="doccomment">//! Furthermore, this path is a prefix-search, so all modules nested in the</span>
<span class="doccomment">//! specified module will also have logging enabled.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The actual `log_level` is optional to specify. If omitted, all logging will</span>
<span class="doccomment">//! be enabled. If specified, it must be one of the strings `debug`, `error`,</span>
<span class="doccomment">//! `info`, `warn`, or `trace`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! As the log level for a module is optional, the module to enable logging for</span>
<span class="doccomment">//! is also optional. If only a `log_level` is provided, then the global log</span>
<span class="doccomment">//! level for all modules is set to this value.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Some examples of valid values of `RUST_LOG` are:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `hello` turns on all logging for the &#39;hello&#39; module</span>
<span class="doccomment">//! * `info` turns on all info logging</span>
<span class="doccomment">//! * `hello=debug` turns on debug logging for &#39;hello&#39;</span>
<span class="doccomment">//! * `hello,std::option` turns on hello, and std&#39;s option logging</span>
<span class="doccomment">//! * `error,hello=warn` turn on global error logging and also warn for hello</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Filtering results</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A RUST_LOG directive may include a regex filter. The syntax is to append `/`</span>
<span class="doccomment">//! followed by a regex. Each message is checked against the regex, and is only</span>
<span class="doccomment">//! logged if it matches. Note that the matching is done after formatting the</span>
<span class="doccomment">//! log string but before adding any logging meta-data. There is a single filter</span>
<span class="doccomment">//! for all modules.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Some examples:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `hello/foo` turns on all logging for the &#39;hello&#39; module where the log</span>
<span class="doccomment">//!   message includes &#39;foo&#39;.</span>
<span class="doccomment">//! * `info/f.o` turns on all info logging where the log message includes &#39;foo&#39;,</span>
<span class="doccomment">//!   &#39;f1o&#39;, &#39;fao&#39;, etc.</span>
<span class="doccomment">//! * `hello=debug/foo*foo` turns on debug logging for &#39;hello&#39; where the log</span>
<span class="doccomment">//!   message includes &#39;foofoo&#39; or &#39;fofoo&#39; or &#39;fooooooofoo&#39;, etc.</span>
<span class="doccomment">//! * `error,hello=warn/[0-9] scopes` turn on global error logging and also</span>
<span class="doccomment">//!   warn for hello. In both cases the log message must include a single digit</span>
<span class="doccomment">//!   number followed by &#39;scopes&#39;.</span>

<span class="attribute">#<span class="op">!</span>[<span class="ident">doc</span>(<span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">&quot;http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png&quot;</span>,
       <span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">&quot;http://www.rust-lang.org/favicon.ico&quot;</span>,
       <span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">&quot;http://doc.rust-lang.org/env_logger/&quot;</span>)]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">deny</span>(<span class="ident">warnings</span>))]</span>

<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">env</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;

<span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">Log</span>, <span class="ident">LogLevel</span>, <span class="ident">LogLevelFilter</span>, <span class="ident">LogRecord</span>, <span class="ident">SetLoggerError</span>, <span class="ident">LogMetadata</span>};

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;regex&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;regex.rs&quot;</span>]</span>
<span class="kw">mod</span> <span class="ident">filter</span>;

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;regex&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;string.rs&quot;</span>]</span>
<span class="kw">mod</span> <span class="ident">filter</span>;

<span class="doccomment">/// The logger.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Logger</span> {
    <span class="ident">directives</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LogDirective</span><span class="op">&gt;</span>,
    <span class="ident">filter</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">filter</span>::<span class="ident">Filter</span><span class="op">&gt;</span>,
    <span class="ident">format</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">LogRecord</span>) <span class="op">-&gt;</span> <span class="ident">String</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span>,
}

<span class="doccomment">/// LogBuilder acts as builder for initializing the Logger.</span>
<span class="doccomment">/// It can be used to customize the log format, change the enviromental variable used</span>
<span class="doccomment">/// to provide the logging directives and also set the default log level filter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate log;</span>
<span class="doccomment">/// extern crate env_logger;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::env;</span>
<span class="doccomment">/// use log::{LogRecord, LogLevelFilter};</span>
<span class="doccomment">/// use env_logger::LogBuilder;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">///     let format = |record: &amp;LogRecord| {</span>
<span class="doccomment">///         format!(&quot;{} - {}&quot;, record.level(), record.args())</span>
<span class="doccomment">///     };</span>
<span class="doccomment">///</span>
<span class="doccomment">///     let mut builder = LogBuilder::new();</span>
<span class="doccomment">///     builder.format(format).filter(None, LogLevelFilter::Info);</span>
<span class="doccomment">///</span>
<span class="doccomment">///     if env::var(&quot;RUST_LOG&quot;).is_ok() {</span>
<span class="doccomment">///        builder.parse(&amp;env::var(&quot;RUST_LOG&quot;).unwrap());</span>
<span class="doccomment">///     }</span>
<span class="doccomment">///</span>
<span class="doccomment">///     builder.init().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">///     error!(&quot;error message&quot;);</span>
<span class="doccomment">///     info!(&quot;info message&quot;);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LogBuilder</span> {
    <span class="ident">directives</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LogDirective</span><span class="op">&gt;</span>,
    <span class="ident">filter</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">filter</span>::<span class="ident">Filter</span><span class="op">&gt;</span>,
    <span class="ident">format</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">LogRecord</span>) <span class="op">-&gt;</span> <span class="ident">String</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">LogBuilder</span> {
    <span class="doccomment">/// Initializes the log builder with defaults</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">LogBuilder</span> {
        <span class="ident">LogBuilder</span> {
            <span class="ident">directives</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(),
            <span class="ident">filter</span>: <span class="prelude-val">None</span>,
            <span class="ident">format</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="op">|</span><span class="ident">record</span>: <span class="kw-2">&amp;</span><span class="ident">LogRecord</span><span class="op">|</span> {
                <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}:{}: {}&quot;</span>, <span class="ident">record</span>.<span class="ident">level</span>(),
                        <span class="ident">record</span>.<span class="ident">location</span>().<span class="ident">module_path</span>(), <span class="ident">record</span>.<span class="ident">args</span>())
            }),
        }
    }

    <span class="doccomment">/// Adds filters to the logger</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The given module (if any) will log at most the specified level provided.</span>
    <span class="doccomment">/// If no module is provided then the filter will apply to all log messages.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                  <span class="ident">module</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span>,
                  <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">push</span>(<span class="ident">LogDirective</span> {
            <span class="ident">name</span>: <span class="ident">module</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_string</span>()),
            <span class="ident">level</span>: <span class="ident">level</span>,
        });
        <span class="self">self</span>
    }

    <span class="doccomment">/// Sets the format function for formatting the log output.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This function is called on each record logged to produce a string which</span>
    <span class="doccomment">/// is actually printed out.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">format</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="lifetime">&#39;static</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">format</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">Self</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">LogRecord</span>) <span class="op">-&gt;</span> <span class="ident">String</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span>
    {
        <span class="self">self</span>.<span class="ident">format</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">format</span>);
        <span class="self">self</span>
    }

    <span class="doccomment">/// Parses the directives string in the same form as the RUST_LOG</span>
    <span class="doccomment">/// environment variable.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// See the module documentation for more details.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">filters</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">Self</span> {
        <span class="kw">let</span> (<span class="ident">directives</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="ident">filters</span>);

        <span class="self">self</span>.<span class="ident">filter</span> <span class="op">=</span> <span class="ident">filter</span>;

        <span class="kw">for</span> <span class="ident">directive</span> <span class="kw">in</span> <span class="ident">directives</span> {
            <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">push</span>(<span class="ident">directive</span>);
        }
        <span class="self">self</span>
    }

    <span class="doccomment">/// Initializes the global logger with an env logger.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This should be called early in the execution of a Rust program, and the</span>
    <span class="doccomment">/// global logger may only be initialized once. Future initialization</span>
    <span class="doccomment">/// attempts will return an error.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">SetLoggerError</span><span class="op">&gt;</span> {
        <span class="ident">log</span>::<span class="ident">set_logger</span>(<span class="op">|</span><span class="ident">max_level</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">build</span>();
            <span class="ident">max_level</span>.<span class="ident">set</span>(<span class="ident">logger</span>.<span class="ident">filter</span>());
            <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">logger</span>)
        })
    }

    <span class="doccomment">/// Build an env logger.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Logger</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">is_empty</span>() {
            <span class="comment">// Adds the default filter if none exist</span>
            <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">push</span>(<span class="ident">LogDirective</span> {
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
                <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>,
            });
        } <span class="kw">else</span> {
            <span class="comment">// Sort the directives by length of their name, this allows a</span>
            <span class="comment">// little more efficient lookup at runtime.</span>
            <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">sort_by</span>(<span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> {
                <span class="kw">let</span> <span class="ident">alen</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">a</span><span class="op">|</span> <span class="ident">a</span>.<span class="ident">len</span>()).<span class="ident">unwrap_or</span>(<span class="number">0</span>);
                <span class="kw">let</span> <span class="ident">blen</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span>.<span class="ident">len</span>()).<span class="ident">unwrap_or</span>(<span class="number">0</span>);
                <span class="ident">alen</span>.<span class="ident">cmp</span>(<span class="kw-2">&amp;</span><span class="ident">blen</span>)
            });
        }

        <span class="ident">Logger</span> {
            <span class="ident">directives</span>: <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">directives</span>, <span class="ident">Vec</span>::<span class="ident">new</span>()),
            <span class="ident">filter</span>: <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">filter</span>, <span class="prelude-val">None</span>),
            <span class="ident">format</span>: <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">format</span>, <span class="ident">Box</span>::<span class="ident">new</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">String</span>::<span class="ident">new</span>())),
        }
    }
}

<span class="kw">impl</span> <span class="ident">Logger</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">Logger</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">LogBuilder</span>::<span class="ident">new</span>();

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">env</span>::<span class="ident">var</span>(<span class="string">&quot;RUST_LOG&quot;</span>) {
            <span class="ident">builder</span>.<span class="ident">parse</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>);
        }

        <span class="ident">builder</span>.<span class="ident">build</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
        <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">d</span><span class="op">|</span> <span class="ident">d</span>.<span class="ident">level</span>).<span class="ident">max</span>()
            .<span class="ident">unwrap_or</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>)
    }

    <span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">level</span>: <span class="ident">LogLevel</span>, <span class="ident">target</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="comment">// Search for the longest match, the vector is assumed to be pre-sorted.</span>
        <span class="kw">for</span> <span class="ident">directive</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">iter</span>().<span class="ident">rev</span>() {
            <span class="kw">match</span> <span class="ident">directive</span>.<span class="ident">name</span> {
                <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">name</span>) <span class="kw">if</span> <span class="op">!</span><span class="ident">target</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">name</span>) <span class="op">=&gt;</span> {},
                <span class="prelude-val">Some</span>(..) <span class="op">|</span> <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                    <span class="kw">return</span> <span class="ident">level</span> <span class="op">&lt;=</span> <span class="ident">directive</span>.<span class="ident">level</span>
                }
            }
        }
        <span class="bool-val">false</span>
    }
}

<span class="kw">impl</span> <span class="ident">Log</span> <span class="kw">for</span> <span class="ident">Logger</span> {
    <span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">metadata</span>: <span class="kw-2">&amp;</span><span class="ident">LogMetadata</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">enabled</span>(<span class="ident">metadata</span>.<span class="ident">level</span>(), <span class="ident">metadata</span>.<span class="ident">target</span>())
    }

    <span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">record</span>: <span class="kw-2">&amp;</span><span class="ident">LogRecord</span>) {
        <span class="kw">if</span> <span class="op">!</span><span class="ident">Log</span>::<span class="ident">enabled</span>(<span class="self">self</span>, <span class="ident">record</span>.<span class="ident">metadata</span>()) {
            <span class="kw">return</span>;
        }

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">filter</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">filter</span>.<span class="ident">as_ref</span>() {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">filter</span>.<span class="ident">is_match</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">record</span>.<span class="ident">args</span>().<span class="ident">to_string</span>()) {
                <span class="kw">return</span>;
            }
        }

        <span class="kw">let</span> _ <span class="op">=</span> <span class="macro">writeln</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">io</span>::<span class="ident">stderr</span>(), <span class="string">&quot;{}&quot;</span>, (<span class="self">self</span>.<span class="ident">format</span>)(<span class="ident">record</span>));
    }
}

<span class="kw">struct</span> <span class="ident">LogDirective</span> {
    <span class="ident">name</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>,
}

<span class="doccomment">/// Initializes the global logger with an env logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This should be called early in the execution of a Rust program, and the</span>
<span class="doccomment">/// global logger may only be initialized once. Future initialization attempts</span>
<span class="doccomment">/// will return an error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">SetLoggerError</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">LogBuilder</span>::<span class="ident">new</span>();

    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">env</span>::<span class="ident">var</span>(<span class="string">&quot;RUST_LOG&quot;</span>) {
        <span class="ident">builder</span>.<span class="ident">parse</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>);
    }

    <span class="ident">builder</span>.<span class="ident">init</span>()
}

<span class="doccomment">/// Parse a logging specification string (e.g: &quot;crate1,crate2::mod3,crate3::x=error/foo&quot;)</span>
<span class="doccomment">/// and return a vector with log directives.</span>
<span class="kw">fn</span> <span class="ident">parse_logging_spec</span>(<span class="ident">spec</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> (<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LogDirective</span><span class="op">&gt;</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">filter</span>::<span class="ident">Filter</span><span class="op">&gt;</span>) {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dirs</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">split</span>(<span class="string">&#39;/&#39;</span>);
    <span class="kw">let</span> <span class="ident">mods</span> <span class="op">=</span> <span class="ident">parts</span>.<span class="ident">next</span>();
    <span class="kw">let</span> <span class="ident">filter</span> <span class="op">=</span> <span class="ident">parts</span>.<span class="ident">next</span>();
    <span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">next</span>().<span class="ident">is_some</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;warning: invalid logging spec &#39;{}&#39;, \
                 ignoring it (too many &#39;/&#39;s)&quot;</span>, <span class="ident">spec</span>);
        <span class="kw">return</span> (<span class="ident">dirs</span>, <span class="prelude-val">None</span>);
    }
    <span class="ident">mods</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> { <span class="kw">for</span> <span class="ident">s</span> <span class="kw">in</span> <span class="ident">m</span>.<span class="ident">split</span>(<span class="string">&#39;,&#39;</span>) {
        <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> { <span class="kw">continue</span> }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">split</span>(<span class="string">&#39;=&#39;</span>);
        <span class="kw">let</span> (<span class="ident">log_level</span>, <span class="ident">name</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">parts</span>.<span class="ident">next</span>(), <span class="ident">parts</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">trim</span>()), <span class="ident">parts</span>.<span class="ident">next</span>()) {
            (<span class="prelude-val">Some</span>(<span class="ident">part0</span>), <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=&gt;</span> {
                <span class="comment">// if the single argument is a log-level string or number,</span>
                <span class="comment">// treat that as a global fallback</span>
                <span class="kw">match</span> <span class="ident">part0</span>.<span class="ident">parse</span>() {
                    <span class="prelude-val">Ok</span>(<span class="ident">num</span>) <span class="op">=&gt;</span> (<span class="ident">num</span>, <span class="prelude-val">None</span>),
                    <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> (<span class="ident">LogLevelFilter</span>::<span class="ident">max</span>(), <span class="prelude-val">Some</span>(<span class="ident">part0</span>)),
                }
            }
            (<span class="prelude-val">Some</span>(<span class="ident">part0</span>), <span class="prelude-val">Some</span>(<span class="string">&quot;&quot;</span>), <span class="prelude-val">None</span>) <span class="op">=&gt;</span> (<span class="ident">LogLevelFilter</span>::<span class="ident">max</span>(), <span class="prelude-val">Some</span>(<span class="ident">part0</span>)),
            (<span class="prelude-val">Some</span>(<span class="ident">part0</span>), <span class="prelude-val">Some</span>(<span class="ident">part1</span>), <span class="prelude-val">None</span>) <span class="op">=&gt;</span> {
                <span class="kw">match</span> <span class="ident">part1</span>.<span class="ident">parse</span>() {
                    <span class="prelude-val">Ok</span>(<span class="ident">num</span>) <span class="op">=&gt;</span> (<span class="ident">num</span>, <span class="prelude-val">Some</span>(<span class="ident">part0</span>)),
                    _ <span class="op">=&gt;</span> {
                        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;warning: invalid logging spec &#39;{}&#39;, \
                                 ignoring it&quot;</span>, <span class="ident">part1</span>);
                        <span class="kw">continue</span>
                    }
                }
            },
            _ <span class="op">=&gt;</span> {
                <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;warning: invalid logging spec &#39;{}&#39;, \
                         ignoring it&quot;</span>, <span class="ident">s</span>);
                <span class="kw">continue</span>
            }
        };
        <span class="ident">dirs</span>.<span class="ident">push</span>(<span class="ident">LogDirective</span> {
            <span class="ident">name</span>: <span class="ident">name</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_string</span>()),
            <span class="ident">level</span>: <span class="ident">log_level</span>,
        });
    }});

    <span class="kw">let</span> <span class="ident">filter</span> <span class="op">=</span> <span class="ident">filter</span>.<span class="ident">map_or</span>(<span class="prelude-val">None</span>, <span class="op">|</span><span class="ident">filter</span><span class="op">|</span> {
        <span class="kw">match</span> <span class="ident">filter</span>::<span class="ident">Filter</span>::<span class="ident">new</span>(<span class="ident">filter</span>) {
            <span class="prelude-val">Ok</span>(<span class="ident">re</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">re</span>),
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> {
                <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;warning: invalid regex filter - {}&quot;</span>, <span class="ident">e</span>);
                <span class="prelude-val">None</span>
            }
        }
    });

    <span class="kw">return</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>);
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">LogLevel</span>, <span class="ident">LogLevelFilter</span>};

    <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">LogBuilder</span>, <span class="ident">Logger</span>, <span class="ident">LogDirective</span>, <span class="ident">parse_logging_spec</span>};

    <span class="kw">fn</span> <span class="ident">make_logger</span>(<span class="ident">dirs</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">LogDirective</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">Logger</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">LogBuilder</span>::<span class="ident">new</span>().<span class="ident">build</span>();
        <span class="ident">logger</span>.<span class="ident">directives</span> <span class="op">=</span> <span class="ident">dirs</span>;
        <span class="ident">logger</span>
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">filter_info</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">LogBuilder</span>::<span class="ident">new</span>().<span class="ident">filter</span>(<span class="prelude-val">None</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>).<span class="ident">build</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>, <span class="string">&quot;crate1&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">filter_beginning_longest_match</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">LogBuilder</span>::<span class="ident">new</span>()
                        .<span class="ident">filter</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>), <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>)
                        .<span class="ident">filter</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;crate2::mod&quot;</span>), <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>)
                        .<span class="ident">filter</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>), <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>)
                        .<span class="ident">build</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>, <span class="string">&quot;crate2::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>, <span class="string">&quot;crate2&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_default</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">LogBuilder</span>::<span class="ident">new</span>().<span class="ident">parse</span>(<span class="string">&quot;info,crate1::mod1=warn&quot;</span>).<span class="ident">build</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>, <span class="string">&quot;crate1::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate2::mod2&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">match_full_path</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">LogDirective</span> {
                <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()),
                <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>
            },
            <span class="ident">LogDirective</span> {
                <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()),
                <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>
            }
        ]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>, <span class="string">&quot;crate1::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate1::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate2&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>, <span class="string">&quot;crate2&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">no_match</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span> },
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span> }
        ]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>, <span class="string">&quot;crate3&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">match_beginning</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span> },
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span> }
        ]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate2::mod1&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">match_beginning_longest_match</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span> },
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate2::mod&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span> },
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span> }
        ]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>, <span class="string">&quot;crate2::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>, <span class="string">&quot;crate2&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">match_default</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">None</span>, <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span> },
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span> }
        ]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>, <span class="string">&quot;crate1::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate2::mod2&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">zero_level</span>() {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">None</span>, <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span> },
            <span class="ident">LogDirective</span> { <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>::<span class="ident">Off</span> }
        ]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Error</span>, <span class="string">&quot;crate1::mod1&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>, <span class="string">&quot;crate2::mod2&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_valid</span>() {
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=error,crate1::mod2,crate2=debug&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">3</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">1</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">1</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">max</span>());

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">2</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">2</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_none</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_invalid_crate</span>() {
        <span class="comment">// test parse_logging_spec with multiple = in specification</span>
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=warn=info,crate2=debug&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_none</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_invalid_log_level</span>() {
        <span class="comment">// test parse_logging_spec with &#39;noNumber&#39; as log level</span>
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=noNumber,crate2=debug&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_none</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_string_log_level</span>() {
        <span class="comment">// test parse_logging_spec with &#39;warn&#39; as log level</span>
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=wrong,crate2=warn&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_none</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_empty_log_level</span>() {
        <span class="comment">// test parse_logging_spec with &#39;&#39; as log level</span>
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=wrong,crate2=&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">max</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_none</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_global</span>() {
        <span class="comment">// test parse_logging_spec with no crate</span>
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;warn,crate2=debug&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">None</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">1</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">1</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_none</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_valid_filter</span>() {
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=error,crate1::mod2,crate2=debug/abc&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">3</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod1&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">1</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate1::mod2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">1</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">max</span>());

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">2</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">2</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="ident">filter</span>.<span class="ident">unwrap</span>().<span class="ident">to_string</span>() <span class="op">==</span> <span class="string">&quot;abc&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_invalid_crate_filter</span>() {
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1::mod1=error=warn,crate2=debug/a.c&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate2&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="ident">filter</span>.<span class="ident">unwrap</span>().<span class="ident">to_string</span>() <span class="op">==</span> <span class="string">&quot;a.c&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse_logging_spec_empty_with_filter</span>() {
        <span class="kw">let</span> (<span class="ident">dirs</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="string">&quot;crate1/a*c&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">name</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;crate1&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dirs</span>[<span class="number">0</span>].<span class="ident">level</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">max</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">filter</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="ident">filter</span>.<span class="ident">unwrap</span>().<span class="ident">to_string</span>() <span class="op">==</span> <span class="string">&quot;a*c&quot;</span>);
    }
}
</pre>
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